1) Some time ago, a feature was added where the spacebar could be used to page down, similar to Safari. However, this does not work in slideshow mode, which I use frequently for reading. Could that be implemented?

2) The spacebar shortcut does work in reading mode, but when I switch to reading mode, the text display switches from my preferred paragraphs with no space and becomes paragraphs WITH space. Is this intentional or a bug? Either way, that probably shouldn't happen. (In case it's a bug, it happened with both the ESVS and the NA27-T, but only if the "Use Readability Theme" preference was checked. I'm running Accordance 10.1.1 on OS 10.8.2.)

2) This is intentional - part of the Readability theme is to use paragraphs with spaces, as it generally helps improve the readability. I wouldn't really call it a bug - just disable the Use Readability Theme preference if its an issue.